IEC 62321-7-2:2017
电工技术产品中某些物质的测定. 第7-2部分: 六价铬. 采用比色法测定电子聚合物中的六价铬(Cr(VI))
Determination of certain substances in electrotechnical products - Part 7-2: Hexavalent chromium - Determination of hexavalent chromium (Cr(VI)) in polymers and electronics by the colorimetric method
IEC 62321-7-2:2017 发布历史
IEC 62321-7-2:2017由国际电工委员会 IX-IEC 发布于 2017-03，并于 2017-03-31 实施。
IEC 62321-7-2:2017 在中国标准分类中归属于: K04 基础标准和通用方法，在国际标准分类中归属于: 31.020 电子元器件综合,71.040.50 物理化学分析方法。
本标准有等同采用的 中文版 GB/T 39560.702-2021 电子电气产品中某些物质的测定 第7-2部分：六价铬 比色法测定聚合物和电子件中的六价铬[Cr（VI）]
IEC 62321-7-2:2017 发布之时，引用了标准
- IEC 62321-1:2013 电工制品中特定物质的测定.第1部分:简介和概述
- ISO 3696:1987 分析实验室用水 规范和试验方法
IEC 62321-7-2:2017的历代版本如下：
- 2017年 IEC 62321-7-2:2017 电工技术产品中某些物质的测定. 第7-2部分: 六价铬. 采用比色法测定电子聚合物中的六价铬(Cr(VI))
This part of IEC 62321 describes procedures to measure hexavalent chromium, Cr(VI), quantitatively in samples of polymers and electronics. This method employs organic solvent to dissolve or swell the sample matrix, followed by an alkaline digestion procedure to extract Cr(VI) from samples. Studies have shown that organic/alkaline solution is more effective than acidic solution in extracting Cr(VI) from soluble and insoluble samples. Minimal reduction of Cr(VI) to Cr(III) or oxidation of Cr(III) to Cr(VI) occurs under alkaline conditions. For soluble polymers consisting of ABS (Acrylonitrile- butadiene-styrene), PC (Polycarbonate) and PVC (poly(vinyl chloride)), the samples are first dissolved in an appropriate organic solvent and Cr(VI) is then extracted by an alkaline extraction solution. For insoluble/unknown polymers, or electronic materials that do not contain antimony (Sb), the samples are digested in a toluene/alkaline solution at 150 °C to 160 °C. Then the organic phase in the extracts are separated and discarded; the inorganic phase is retained for Cr(VI) analysis. The Cr(VI) concentration in the extract is determined by its reaction under acidic conditions with 1,5-diphenylcarbazide. Cr(VI) is reduced to Cr(III) in the reaction with diphenylcarbazide which is oxidized to diphenylcarbazone. The Cr(III) and diphenylcarbazone form a red-violet- coloured complex in the reaction. The complex solution is measured quantitatively by a colorimeter or a spectrophotometer at 540 nm.
- 标准号
- IEC 62321-7-2:2017
- 发布
- 2017年
- 中文版
- GB/T 39560.702-2021 (等同采用的中文版本)
- 发布单位
- 国际电工委员会
- 当前最新
- IEC 62321-7-2:2017
- 引用标准
- IEC 62321-1:2013 ISO 3696:1987
- 被代替标准
- IEC 111/408/CDV:2016 IEC 62321:2008(部分代替)